Guernsey star Watson played an influential role as Team GB came through the Europe/Africa zonal group tie in Tallinn, Estonia, at the weekend.
The Brits overcame Portugal and Estonia in the round-robin stage and then beat Hungary in Saturday's play-off to reach the World Group II play-off for the second consecutive year.
The GB @FedCup Team will face Japan away in the World Group II Play-Offs! #BackTheBrits 🇬🇧 #LetsDoThis pic.twitter.com/f2M6qrcXwV
— LTA (@the_LTA) February 13, 2018
The tie away to Japan will take place on 21-22 April.
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